And last night, we told you about that record shattered at the super bowl. 111.5 million viewers, the most-watched TV event in history. But in the last couple of days, a lot of viewers became detectives on that halftime show with Bruno Mars. And tonight, the red hot chili peppers confirm, you did see something strange. ABC's Neal Karlinsky, tonight. Reporter: Halftime at the super bowl. And flea, the wild-eyed, pier-jumng bass player for the red hot chili peppers is playing his heart out. Or is he? Some were watching very closely. And they pounced. Flea's bass wasn't plugged in. That guitar is plugged into nothing, tweeted fellow musician, Vernon reed. Flea and the band's guitar player were unplugged. Look at the pictures from the super bowl, compared to a Normal concert. Even with a wireless unit, the guitar has to plug into something. No comment from the red hot chili peppers. But flea did have this cryptic nondenial on Twitter -- no trickery. No choice. But no trickery. Lip-sync csi has become a sort of sport for hawk-eyed viewers at big events. Remember beyonce's lip-synced presidential inauguration last year? &#9834; Oh, does that &#9834; Reporter: She pushed back at the critics by singing for them at a press conference. &#9834; The brave &#9834; Any questions? Reporter: The NFL has no comment on this year's controversy. And neither does Bruno Mars, for that matter. We're taking it on faith that his smooth tones were live and not memorex. Neal Karlinsky, ABC news, Seattle.

This transcript has been automatically generated and may not be 100% accurate.

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